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13+15v=-9+4v
We move all terms to the left:
13+15v-(-9+4v)=0
We add all the numbers together, and all the variables
15v-(4v-9)+13=0
We get rid of parentheses
15v-4v+9+13=0
We add all the numbers together, and all the variables
11v+22=0
We move all terms containing v to the left, all other terms to the right
11v=-22
v=-22/11
v=-2
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